Remington front sling swivel mounting screw threads

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SteveM
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Remington front sling swivel mounting screw threads

Postby SteveM » Mon Jan 09, 2017 6:27 pm

Anyone know what the thread pitch is on the front sling swivel mounting screw for a Remington 513T Matchmaster?

SlingSwivel.jpg


Appears to be a size 10, but not a 10-32.

Of, if anyone knows a source for a replacement, that would help too.

Steve

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Re: Remington front sling swivel mounting screw threads

Postby Harold_V » Mon Jan 09, 2017 11:44 pm

Measure the major diameter and then check the thread pitch. You can use a machinist's ruler to do that if you don't have the proper pitch gauge. Measure the number of threads in a given distance (¼", or ½") then multiply by 4 or 2 to determine TPI.

Harold
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Patio
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Re: Remington front sling swivel mounting screw threads

Postby Patio » Mon Jan 09, 2017 11:56 pm

Google is your friend. :)
https://www.gunpartscorp.com/Categories ... esults=100
Hope that helps.
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SteveM
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Re: Remington front sling swivel mounting screw threads

Postby SteveM » Tue Jan 10, 2017 7:07 am

Harold_V wrote:Measure the major diameter and then check the thread pitch. You can use a machinist's ruler to do that if you don't have the proper pitch gauge. Measure the number of threads in a given distance (¼", or ½") then multiply by 4 or 2 to determine TPI.


The problem is that we don't have the screw, so I need to make one for an unknown threaded hole that is too small to get a pitch gauge into.

I was thinking of using some small screws to see if I can feel what size catches and what doesn't.



They are out of stock, just like everyone else I have found so far.

Steve

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Re: Remington front sling swivel mounting screw threads

Postby spro » Wed Jan 11, 2017 8:50 pm

I'm sure gunsmiths have different ways and agents which harden in the threads and can be withdrawn. I few pieces of light wood which can screw into the hole and withdrawn can clean the thread down to the root. Then a little machine oil applied to the thread with a toothpick. The next piece of wood conforms to the shape and the oil leaves a dark imprint of the tpi.

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SteveM
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Re: Remington front sling swivel mounting screw threads

Postby SteveM » Thu Jan 12, 2017 9:22 am

spro wrote:I'm sure gunsmiths have different ways and agents which harden in the threads and can be withdrawn. I few pieces of light wood which can screw into the hole and withdrawn can clean the thread down to the root. Then a little machine oil applied to the thread with a toothpick. The next piece of wood conforms to the shape and the oil leaves a dark imprint of the tpi.


Excellent idea. Never thought of that.

Steve

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Metalman
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Re: Remington front sling swivel mounting screw threads

Postby Metalman » Thu Jan 12, 2017 7:25 pm

You may have looked already but did you try Brownells?
Ernie F.

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SteveM
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Re: Remington front sling swivel mounting screw threads

Postby SteveM » Sun Jan 15, 2017 6:55 pm

Well, I have the parts here, and the pitch using spro's method appears to be 42! Not 40, not 44!

There are special thread sizes in 40,44 and 48, but not 42.

The minor diameter of the threaded hole it does into is 0.178 (measured with a small hole gauge and verified with a pin gauge).

Using a thread calculator spreadsheet, I input the major diameter of a #12 screw (0.216) and 42tpi and it says that the smallest minor diameter of an internal thread is 0.1812, which is larger than the 0.178 of the hole.

Thought there was a possibility if was metric, and a conversion chart and Maryland Metric ( https://mdmetric.com/tech/tict.htm ) says that 0.6 in metric is 42-1/4tpi, but a chart at Engineer's Edge ( http://www.engineersedge.com/hardware/m ... sizes1.htm ) says that the only screws with 0.6 for the pitch are 3.5mm, which is too small (the minor diameter is 4.5mm)

Does it look like I'm just going to have to start threading something 42tpi and just keep taking off until it fits?

Steve

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GlennW
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Re: Remington front sling swivel mounting screw threads

Postby GlennW » Mon Jan 16, 2017 8:12 am

It's even worse than you thought!

.1813" is the minimum minor diameter for an external thread.

The minimum minor diameter for an internal thread would be .190".

A #11-42 would work out though, as it has a minor of .177" to .183"!
Glenn

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GlennW
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Re: Remington front sling swivel mounting screw threads

Postby GlennW » Mon Jan 16, 2017 8:34 am

In case you want to give it a try...

SteveM.jpg
Glenn



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LVRR2095
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Re: Remington front sling swivel mounting screw threads

Postby LVRR2095 » Mon Jan 16, 2017 9:13 am

Steve....did you try Sarco in Easton, PA for the parts you need? They have tons of parts and list front sling swivels for the Remington 513 T on their web site.
Sometimes it is easier to just buy a part.

Keith

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GlennW
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Re: Remington front sling swivel mounting screw threads

Postby GlennW » Mon Jan 16, 2017 10:19 am

Owning a lathe can sometimes cloud up the thought process. :wink:
Glenn



Operating machines is perfectly safe......until you forget how dangerous it really is!


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